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| THPMN091 |
Study on High Flux Accelerator Based Slow Positrons Source
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2921 |
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- J. Long, S. Chemerisov, W. Gai, C. D. Jonah, W. Liu, H. Wang
ANL, Argonne, Illinois
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This work represents a new direction in the development of linac-based high intense slow positron source. The approach is to use RF cavities to decelerate positrons (to ~100 keV) which are produced from a high-energy electron (~10 MeV) beam irradiating a heavy-metal target. In this paper, we present simulation works on the technique to decelerate the positrons to energies where techniques such as penning traps, DC deceleration or moderation can be done with high efficiency. Present techniques for decelerating positrons by thermalizing them in tungsten moderator have an efficiency of 10-3 to 10-5 slow positrons per high energy positron, so even modest success in decelerating and trapping positrons can lead to an increase in the production of low-energy positrons. The challenging aspect of this work is the broad energy and angular distribution of the positrons produced by pair-production in the heavy-metal target. We have explored the use of an adiabatic-matching device and a pillbox RF cavity and have obtained promising results.
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